Optical: systems and elements – Lens – With field curvature shaping
Reexamination Certificate
2005-03-22
2009-02-10
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Lens
With field curvature shaping
C359S650000, C359S651000, C359S726000, C359S798000, C359S799000, C359S800000, C359S806000, C359S665000, C359S666000, C359S355000, C355S053000
Reexamination Certificate
active
07489448
ABSTRACT:
An optical scanning device provides a radiation source (2,200), a collimator lens (4,40), an objective (7,90) for converting a beam (5,30′) to a scanning spot at the position of an information layer (101) of a record carrier (1,100). The device also includes an electrowetting cell (6). The electrowetting cell (6) acts such that a beam (5,30′) enters the objective (7,90) at a predetermined height of an entrance pupil of the objective (7,90) independent of the position of the objective (7,90) and that the beam (5,30′) forms a predetermined angle at the entrance pupil of the objective (7,90) with the optical axis (8). In this way the rim intensity may be kept constant over the entrance pupil of the objective (7,90).
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Hendriks Bernardus Hendrikus Wilhelmus
Kuiper Stein
Schleipen Johannes Joseph Hubertina Barbara
Belk Michael E.
Koninklijke Philips Electronics , N.V.
Lester Evelyn A.
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